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01-06-2011, 09:59 PM | #1 |
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3.91 ring & pinion gear set.
Hi guys,
I'm new here and would like to seek your expertise. Does anyone know if 3.91 ring & pinion gear set from turner (http://www.turnermotorsport.com/html...CT_ID=E46M3-RP) is plug and play into the Z4M rear diff? Thanks in advance. |
01-06-2011, 10:29 PM | #2 |
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Since it's for the E46 M3, yes it is plug & play. E46 M3 and E85/E86 Z4M have the exact same differentials. I'm about to have my REM-polished ring & pinion installed next week, along with my AutoSolutions SSK
I was able to get a reputable BMW race shop to do the gut transaction for $930 labor-only. A different gear shop quoted me $760, but the extra couple hundred spent @ a legit shop gives me huuuge peace of mind. Last edited by mfanatic325; 01-07-2011 at 12:13 PM.. |
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01-07-2011, 06:33 AM | #3 |
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Does it fit? Yes.
Is it plug & Play? IMO, NO. As mfanatic325 says, get a reputable shop to do the internals for you. If you do your own wrenching, you can do the pumpkin re & re yourself.
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01-17-2011, 01:07 PM | #5 |
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01-17-2011, 01:41 PM | #6 |
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01-17-2011, 04:02 PM | #7 | |
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If your car is relatively low-mileage, I would recommend that you get your own differential rebuilt, as opposed to swapping in an already-built diff. Because you never know what kind of mileage those swaps had on them before they were built. Whereas you know how many miles your very own car's diff has on it. So unless the shop you're trading diffs with is willing to cover that built diff for more than a year in terms of workmanship/warranty, then I would just get your own personal diff rebuilt instead of swapping. |
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01-17-2011, 04:20 PM | #8 |
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What was the cost out the door? $930 plus a rebuild kit and r&p starts to get pricey.
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01-17-2011, 04:24 PM | #9 |
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I got my REM-polished ring & pinion for $500 shipped (very good deal). Then the total labor for the differential rebuild, including shim kit and a fluid flush, was $950 cash out the door (good deal as well).
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01-17-2011, 06:42 PM | #10 | ||
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Thanks for the Shop recommendation! Quote:
Did the $950 include the labor to remove/re-install the Diff from the car or did you do that first and just bring the Diff to the shop to do the R&P swap? Last edited by marinb; 01-17-2011 at 07:07 PM.. |
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01-17-2011, 07:43 PM | #11 | |
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The $950 was all-inclusive. I'm going in on Wednesday for my 1200-mile service. I'll be slightly over 1200 by then but that's okay |
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01-17-2011, 07:58 PM | #12 | |
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Great news about reaching 1200 miles, now you can really let it rip! |
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01-17-2011, 08:22 PM | #13 |
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Whats the difference (if any) between the Timken and the BMW OEM one?
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01-17-2011, 08:58 PM | #14 | |
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I feel like it's been a really good break-in thus far regardless though Probably just different type of material and/or manufacturing processes used. Then of course, the different branding and probably pricing as well. In the end, as long as it fits well and is equivalent to or exceeds REM-polish, you're good as gold |
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01-17-2011, 10:21 PM | #15 |
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What does the 1200 mile service entail? Fluid flush/inspection?
Sorry for all the cost-related questions. I'm just trying to budget an out-the-door price after shim kit, labor, r&p, services, etc... looks like we're at $950 + (r&p) + (1200 mile service) |
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01-18-2011, 01:53 AM | #16 | |
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$950 cash out the door for removing the differential AND rebuilding it with my supplied 3.91 ring & pinion; with shim kit included in the price (which the shop sourced from DINAN). The first fill-up of Differential fluid is included in this price as well. Then I'm paying for the 1200-mile service, where they're nice enough to throw in the labor free of cost, but I must pay for the diff fluid myself of course, which is $100+. |
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01-18-2011, 03:19 PM | #17 | |
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i was able to get away with 2 bottles of redline 75w90ns (no friction modifiers) in my quaife, for $25 shipped via amazon.com... the cost of owning a /m i guess? haha... speaking of which i think redline now offers engine oil in the 10w60 |
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01-18-2011, 03:30 PM | #18 |
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haha yeah, the OEM stuff. The race shop manager said he's tried all kinds, and found that OEM is still the best in terms of diff fluid. The other stuff he's tried had some grinding and such, so he always recommends OE fluid now.
As for motor oil, I figure yeah, gotta pay to play lol. Better safe than sorry. It's all probably the same anyhow, but I'm not down to take any risks on these expensive-to-replace items (such as motor, transmission, differential, etc. etc.). |
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01-18-2011, 08:24 PM | #19 |
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mfanatic,
Looking forward to your review of the 3.91. I've been thinking about doing this in my "long term," plan. Any chance you are willing to give a ride when you have her good and broken in so I can feel the pull? |
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01-18-2011, 08:31 PM | #20 | |
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I did short review here: http://www.zpost.com/forums/showthre...441622&page=14 Starting with post #292 in that thread |
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